R: A quantitative measure of NMR signal receiving efficiency.
R: A quantitative measure of NMR signal receiving efficiency.
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DOI：
10.1016/j.jmr.2009.07.004
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发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
Raftery D
中科院分区：
文献类型：
--
作者：
Mo H;Harwood J;Zhang S;Xue Y;Santini R;Raftery D
认识到NMR的灵敏度受样品的电导率和介电常数等因素的影响，我们提出了接收效率的概念，以表征在最佳探针调谐和匹配条件下，如何有效地从样品中的单位横向磁化中观察到NMR信号。方便地，相对接收效率可以定义为由感兴趣的样品和参考溶液中的单位横向磁化引起的NMR信号的比率。根据核磁共振中激发与观测之间的倒数关系，可以将相对接收效率与90°脉冲长度（τ90）关联起来。在理想探头调谐的特殊情况下（阻抗匹配到50 Ω），与τ90成反比。NMR接收效率在定量分析中的应用可以为几乎任何样品提供单一的外部浓度参考，无需知道其确切的化学成分或详细的电磁特性。
Recognizing that the sensitivity of NMR is influenced by factors such as conductance and dielectric constant of the sample, we propose the receiving efficiency ℜ to characterize how efficiently the NMR signal can be observed from a unit transverse magnetization in a sample under optimal probe tuning and matching conditions. Conveniently, the relative receiving efficiency can be defined as the ratio of the NMR signal induced by a unit transverse magnetization in a sample of interest and a reference solution. Based on the reciprocal relationship between excitation and observation in NMR, the relative receiving efficiency can be correlated with the 90° pulse length (τ90). In the special case of perfect probe tuning (impedance matched to 50 Ω), ℜ is inversely proportional to τ90. Application of the NMR receiving efficiency in quantitative analysis potentially enables a single external concentration reference for almost any sample, eliminating the need to know its exact chemical composition or detailed electromagnetic properties.
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